Cylinder-grinder.



L. E. CLAWSON.

CYLINDER GRINDER.

APPLICATION FILED MAR. 30. 1915.

1,154,878. x Patentedsept. 21, 1915.

WITNESSES: I

A u IN VENTOR Zea ardlyfazywz,

.whicha cylinder and LEONARD E. CLAWSON, 0F SAN FRANCISCO, CALIFORNIA.

CYLINDEBAGRINDER.

Specification of Letters Patent. Patented Sept 21, 11915.

Application filed March 30, 1915. Serial No.v 18,070.

To all whom it may concern Be it known that I, LEONARD E. CLAwsoN, a citizen vof the United States, residing in the cityand county of San Francisco and State of California, have invented new and useful Improvements in Cylinder-Grinders,

of which the following is a specification.. My invention relates to a device for grindlng and inishingthe interior of cylinders and like surfaces to any desired degree of accuracy .and smoothness.

It consists of a longitudinally grooved head centered and adapted to move within the cylinder or surface to be ground, and having a means 'for supplying a multitude of small balls together with a suitable grinding or abrasive substance and feeding them down through the longitudinal channels of the grinding head so that they Acontact with and grind the interior of the cylinder as the head is moved downwardly, and by an inclination of the grooves or channels the balls are constantly fed downward and held to their work.

It also comprises details of construction which willbe more fully explained'by reference` to the accompanying drawings, in

Figure 1 is a longitudinal section of partially of the grinding head, showing also the channels-and balls Within. Fig. 2 is a horizontal section through the same. Figs. 3 and 5 are sectional views showing channeled ball carriers varied to suit diHerent sizes of cylinders. F ig.4isa sectional view of a cylinder, showing the grinding head guided to move centrally through the cylinder.

The object of this invention is toiprovide a means forl grinding. and finishing the interior of cylindrical surfaces.

As shown in the drawings, A represents a cylinder of any suitable construction, the

interior of which) it is desired to finish.

2 is a headmounted upon a shaft 3 which is guided in bearings, at top and bottom, as

shown at 4, so that the head will be maintained in proper central position with relation to the cylinder. This head has grooves 'or channels made in it, as shown at 5. These grooves are preferably inclined from the top toward the bottom and are adapted to receive a large number of small balls having a'quality of wearing or grinding away any surface with which they are brought into forcible contact. These-balls passing down the channels project slightly therefrom against the interior of the cylinder, and upon the head being turned around within the cylinder the balls will be carried around so as to'v grind the interior surface and gradually reduce it to av perfectly even polished condition. The balls willI move down the inclined grooves gradually as the wear proceeds and will eventually be dis'- charged at the lower end.

The movement of the balls through the cylinder may be eected by gradually feeding the grindinghead down through the cylinder either by gravitation or by direct force. The upper end of the grinding head is formed with a hollow receiving section, as at 6, into which the balls 7 are discharged in quantities, and the top of the head has .an outwardly curved, chambered portion, as at 8, which directs the balls downwardly and into the channels or grooves 5. Any suitable numberof the grooves or channels may be employed, as shown in Fig. 2.

In Figs. 3 and 5 I have shown guides 9 fitted to the channels bydovetailing, or other equivalent means, so that they can be slipped into position and retained there. These guides are grooved or channeled on the outer faceso as to receive theballs and retain them' in position to be carried around inside of the cylinder, as before described. The guides are made of different depths radially so that different sets of guides may be used according to the size of the cylinder. Thus a set ofl the guides may be employed which project very slightly from theface of the head and will serve for a certain size of cylinder, while if a larger sizedcylinder is to be used a set of guides projecting farther, as shown in Fig. 5, will carry the balls out to grind the interior of the larger cylinder. Work may thus be performed very accurately and rapidly.

It will be obvious that by thev inclination of the ball channels and the revolution. of the head, as shown by the arrowa, the balls will be fed downwardly automatically as the head rotates.

Having thus described my invention, what I claim and desire to secure by Letters inder'to be ground, said head having diego-'- nally disposed open ended channels from end to end, grinding balls movable through the channels of the head, with their surfaces contacting with the interior of the cylinder, and means to constantly advance the balls between the head and cylinder.

2. A cylinder grinding tool comprising a vertically journaled head axially coincident with the cylinder to be ground, open ended channels extending diagonally from end to end of the head, grinding balls movable by gravitation through the said channels, and peripherally contacting with the cylinder and means to deliver balls continuously to the channels.

3. In a cylinder grinding tool, a vertically journaled head axially revoluble within the cylinder, open ended guide channels extending diagonally from end to end of the head, balls movable by gravitation through the channels with their surfaces in contact with the cylinder interior, a source of supply ended channels extending diagonally from end to endof the head, guides fitting said channels and having grooves in the surfaces, balls movable by gravitation through the grooves with their surfaces in contact with the cylinder interior, said guides being interchangeable to fit the channels to cylinders of different sizes.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses. y

LEONARD E. CLAWSON Witnesses:

G. H. STRONG, JOHN H. HERRING. 

